Applying design patterns to high-performance C++ code

Applying design patterns, especially strategy pattern and chain of responsibility pattern, to high-performance C code can significantly improve performance. Strategy pattern separates algorithms into independent objects, allowing them to be easily switched at runtime. The chain of responsibility pattern links objects into a chain, handles requests in order, and reduces useless branches and conditional statements. These patterns help create reusable, maintainable, and efficient code.

Design pattern applications in high-performance C code

Design patterns are recurring solutions in software development. They Provides a way to organize code into a reusable, maintainable and efficient form. In performance-critical C code, the application of appropriate design patterns can significantly improve performance.

Strategy Mode

Strategy mode is used to choose between different algorithms or behaviors. By separating algorithms into independent objects, it allows them to be easily switched at runtime. For scenarios involving heavy computation or frequent algorithm changes, the Strategy pattern can save overhead and improve performance.

Practical case:

class SortStrategy {
public:
    virtual void sort(std::vector<int>& data) = 0;
};

class BubbleSort : public SortStrategy {
    void sort(std::vector<int>& data) override {
        // 执行冒泡排序算法
    }
};

class QuickSort : public SortStrategy {
    void sort(std::vector<int>& data) override {
        // 执行快速排序算法
    }
};

By using the strategy pattern, you can easily plug different sorting algorithms into your application without modifying the code.

Chain of Responsibility Pattern

The Chain of Responsibility pattern links objects into a chain to handle requests in order. Each object has a chance to handle the request, and if it cannot handle it, it passes the request to the next object. For scenarios that require hierarchical decision-making or processing of sequential operations, the Chain of Responsibility pattern can improve performance because it reduces useless branches and conditional statements.

Practical case:

class Approver {
public:
    virtual bool approve(const Request& request) const = 0;
    virtual Approver* getNextApprover() const = 0;
};

class Supervisor : public Approver {
    bool approve(const Request& request) const override {
        if (request.getAmount() < 1000) {
            return true;
        } else {
            return getNextApprover()->approve(request);
        }
    }
    Approver* getNextApprover() const override {
        return m_manager;
    }

private:
    Manager* m_manager;
};

class Manager : public Approver {
    bool approve(const Request& request) const override {
        if (request.getAmount() < 5000) {
            return true;
        } else {
            return getNextApprover()->approve(request);
        }
    }
    Approver* getNextApprover() const override {
        return m_ceo;
    }

private:
    CEO* m_ceo;
};

class CEO : public Approver {
    bool approve(const Request& request) const override {
        return true;
    }
    Approver* getNextApprover() const override {
        return nullptr;
    }
};

void processRequest(const Request& request) {
    Approver* supervisor = new Supervisor();
    Approver* manager = new Manager();
    Approver* ceo = new CEO();

    supervisor->setNextApprover(manager);
    manager->setNextApprover(ceo);

    if (supervisor->approve(request)) {
        // 请求已批准
    }
}

This design pattern allows you to easily add additional approvers or adjust the approval order without modifying existing code.

Conclusion:

Applying design patterns to high-performance C code can significantly improve performance. Through the proper selection and application of different patterns, developers can create reusable, maintainable, and efficient code. Strategy pattern and Chain of Responsibility pattern are two patterns that are particularly useful in high-performance C development.

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